Lifting-jack



(No Model.)

W. O. CRAWFORD.

LIFTING JACK No. 555,802. Patented Mar. 3,1896.

lhviTnn sTaTrs PATENT rricn.

WVESLEY C. GRAIVFORD, OF METAMORA, INDIANA.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 555,802, dated March 3, 1896.

Application filed September 6, 1895. Serial No. 561,605. (No model.)

To aZZ whom it pray concern:

Beit known that I, \VESLEY C. CRAWFORD, a citizen of the United States, residin at Metamcra, in the county of Franklin and State of Indiana, have invented certain new and useful Improvements in Lifting-Jacks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention, while relating to liftingjacks generally, is especially directed to improvements in that class of jacks which are employed in connection with wagons and other vehicles.

The invention has for its object the prod action of a device of this character possessing advantages in point of simplicity and cheapness of construction and effectiveness in action, and added to these the device requires but the minimum of power in its operation, is light of weight, and, having comparatively very few parts, is not liable to disorder.

The nature of my invention will become clearly apparent from a reading of the following detailed description when taken in connection with the accompanying drawings, in which- Figure 1 is a perspective view of my improved jack. Fig. 2 is an elevation of the j ack with the position it assumes before lifting in full lines and with the position it assumes after lifting in dotted lines. Fig. 3 is an elevation of the rear side of the jack, a portion being cut away to show the preferred means for vertical adjustment.

Referring to the said drawings by letter, A denotes the standard which supports the working parts and receives the weight of the wagon or other body. Said standard is preferably of rectangular form, and is provided with any suitable means for vertical adjustment, the preferred means being to form the standard in two parts the upper one of which, a, has a tongue at slidably arranged in a recess a in the lower part, o The lower part and the tongue at are provided with transverse holes a a through which is passed a latch pin or pins 1), the latter thereby sup porting the upper part at any desired height. On the outer sides of the lower part are plates 0 c which form walls for the recess a Near the top of the upper part, a, is a pin d which projects beyond each side of said part and forms a journal for a loosely-mounted wheel c and a pivot for the operating-lever f. For convenience in construction the pin is in the form of a headed bolt, the end of which is threaded and has a nut cl. That corner of the standard adjacent to the wheel and the pivotal point of the lever is rounded off concentrically with the periphery of the wheel, but the radius of said rounded portion is less than that of the wheel, in order that said wheel may project slightly beyond the standard, for a purpose presently to be explained.

The operating-lever is pivotally arranged on the side of the standard opposite to the wheel, and the inner end f of said lever is of sufficient length to project beyond the standard and the periphery of the wheel. Said end, however, may be shortened at will as I form in the lover a longitudinal slot f which receives the pivot-pin cl.

As before stated, the standard is generally rectangular in shape and is of suflicient width to provide a broad foot or base, in order that the device when vertically placed may so re main.

In the operation of liftingsuch, for in stance, as a wagon body-the device is placed in the inclined position shown in full lines in Fig. 2, with the lower corner at on the ground or floor, directly beneath the axle, and the lifting end f of the lever and the periphery of the wheel engaging the axle. WVith the parts in this position the handle end of the lever is depressed and the lifting end is consequently elevated and raises the axle and body until the weight of the latter is shifted from the lever to the wheel, which revolves under the movement of the body by its contact with the axle. As soon as the Wheel re- The employment of the slot in the lever insures the proper operation of the device at all times, inasmuch as the axle or other weight to be raised may be always brought into contact with the wheel by shortening the lifting end of the lever.

From the foregoing it will be evident that manual power is necessary only to start the device, or, in other Words, the lever is out of operation as soon as the axle which is in engagement with the wheel shall have passed the dead-center, so to speak, after which the automatic restoration of the vertical position of the standard completes the elevation of the wagon-body.

I claim as my invention 1. A lifting-jack comprising a standard, a wheel mounted at one side of the upper end thereof and projecting beyond said end, and a lever the lifting end of which projects beyond the periphery of the wheel.

2. Alifting-jack comprising a standard vertically adjustable and having a rounded up per corner, a wheel mounted on the standard and projecting beyond said corner, and a lever pivoted on the opposite side and having its lifting end projecting beyond the periphery of the wheel.

in presence of two witnesses.

lVESLEY C. CRAlVFORD.

\Vitnesses:

EDWIN W. HIGH, STEPHEN O. J INKS. 

